Method of making hollow pistons.



H. H. PATRICK. METHOD OF MAKING HOLLOW PISTONS.

APPLICATION IILED MAY 6, 1912.

. Fig.1

Fig.3

WITNESSES "f I/j/ Fig.4

IIIVVENTOR.

ATTORNEYS Patented May 13, 1913.

' nIcK, subject ofthe King .m the city of Birming UNITED sr T s OFFICE.

mam mar-Pamela or amo g; nmmomx, "3113mm, nssronbn TO OXYGEN WILDINGWORKS monor nonnow risrons.

P te ted my 13, 1913. J

ornmmermx,

4 Speemcation of Letters Patent. Applicafiufled ini 0,1912. 10.698361.

ENGLAND.

i and has .for its' object to construct an improved piston which reducesthe inertia ef.-.

facts and the wear experienced with ordi-f nary istons, is cheaper toconstruct, and is capab e of being very convenientlycase-hardened. E vThe invention comprises the construction of the piston from steel tubehaving a closing plate and gudgeon pin bearing bases 'autogenou'sly,electrically or similar y welded thereon.

The invention furthercomprises the formation of the grooves in thepiston for the piston rings by rolling or equ valent opera tlons.

In the accompanying sheet of explanatory -d1 awings:'F1gure 1 is a.sectional view Figs. 3 and 4 are sections of my pistons.

' -tor vehicle en 'ne as shown in Figs. 1 and 2,

drilled with a pair of diametri'ca f site apertures into which shortsolid lar portions c are toserve as the bearlngs or bosses for the iillustrating the elements from which my improved pistons areconstructed, and Fig. 2 1s a similar view of afinished piston. ofmodified forms he same reference'letters in the difierent views indicatethe-same parts. In the construction of a piston'for a mothe-body a o-the pistonis formed from a portion of weldless steel tube. Onsone endl's welded a cover-e which may take the formof either a'fiat orihgzidished plate. The adjacent ed of the plate or may be chamfere s isshown. About -way between the ends the bodyi-of the iston is y p ortuugudgeon pin. The

cover and the bosses are in position .by .autogenous, electrical solidportionsc are employed these or similar welding.

subsequently drilled as shown to receive e gudgeon At the partswhereweldof Great Britain,

0 which the renew n of the and avoids desired its is formed in the istontoreceive the as also embedded in 1t a- .position the ball automaticallysprings is to be efiected it i s-preferable to shape the parts so that agroove or. is provided'for' the reception of the metal'by which the,arts are united. In Fig. '1. the

groove at e 0f the pi stonia made by- I th hbd chamfering y. and makmg'-the cover of slightl smaller diameter than Ar nd 1: e bosses th bychamfering the holes inthc body.

- Th e grooves d for the reception of the f Baton rings maybe forinedinthe tubular.

, y before the application of the coverand the gu I 11 pin able or.equivalent operation :fiormed either in the cold or hot state. method ofproducing the ves is veryfadie ody. e grooves are formed eto by my suit'vantageous in that-1t ena les metal of uniform. thiclmes to be providedin all parts thicken ngadjacent to the occurs in pistons as ordinarilymade. A Piston mve i h wn i F s In other respects the piston issimilar-to that shownin-Fi 1and2.

The comp ete piston is machined up injthe ordinary way to the size, andif outer wearing surface may-be theneoessity 'for ves which case arde edin any "convenient manner. In someiforms the upper endis made thicker.

than the lower, and the plston rings in the upper end are cut, insteadof being rolled, as above described. Such a form isshown in 2. Inanother form the'skirt or lower end of the piston is provided with a'thickened portion in which a groove is cut for the reception of ascraping or additional" ring. This is shown in Fig. 4.

- For securing-the gudgeon in as e in position a small key f is fo thepin, and acorresponding slot or recess e ge P I ball 9 or other catch-orpawl which lspre'ssed aperture is provided in one of the bearing'bosses'into which the ball canpartially engudgeon pin is inserted ininto ter. When the the said aperture and'efi'ectively'secures theagainst endwise movement. T0 withw the pin it is necessary firs,tto'disengiflgfl the ball by pressing it into the pin against thespring'action.

'Having thus described my invention what -on one end of outward by meansof a spring hand; an r I claim as new and desire to secure by Leti endedtubular body 'ings to ters Patent is:

1. The method herein described of making hollow pistons with inwardlyprojecting bearing bosses,-consisting in forming oppositely arranged atabout its center of length, securing bearing bosses in said open extendinto the body, and securing a plate on one end of the said body.

. 2. The method herein described of making hollow pistons with inwardlyprojecting bearing bosses, consisting in forming op ositely'arrangedopenings in an open en ed openings in an open tubular body at about itscenter of length,

securing solid blocks in saidopenings to extend into the body, formingbores in said blocks whereby to form said blocks into hollow bearingbosses for the reception of a gudgeon pm, and securing a plate on oneend of said body.

In testimony whereof I have signed my name to this specification in thepresence of two subseribirllg witnesses.

- HUB RT HARRY PATRICK. Witnesses:

Jorm MORGAN, Fmnois MALPAB.

